JP4610936B2 - FIBER SHEET FOR REINFORCING CONCRETE STRUCTURE AND REINFORCING METHOD - Google Patents
FIBER SHEET FOR REINFORCING CONCRETE STRUCTURE AND REINFORCING METHOD Download PDFInfo
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- JP4610936B2 JP4610936B2 JP2004170015A JP2004170015A JP4610936B2 JP 4610936 B2 JP4610936 B2 JP 4610936B2 JP 2004170015 A JP2004170015 A JP 2004170015A JP 2004170015 A JP2004170015 A JP 2004170015A JP 4610936 B2 JP4610936 B2 JP 4610936B2
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- 239000000835 fiber Substances 0.000 title claims description 93
- 239000004567 concrete Substances 0.000 title claims description 45
- 230000003014 reinforcing effect Effects 0.000 title claims description 39
- 238000000034 method Methods 0.000 title claims description 14
- 239000011347 resin Substances 0.000 claims description 29
- 229920005989 resin Polymers 0.000 claims description 29
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 15
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 14
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical group C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 claims description 11
- 230000002787 reinforcement Effects 0.000 description 20
- 230000000704 physical effect Effects 0.000 description 9
- 239000002759 woven fabric Substances 0.000 description 8
- 239000004925 Acrylic resin Substances 0.000 description 7
- 229920000178 Acrylic resin Polymers 0.000 description 7
- 238000005470 impregnation Methods 0.000 description 7
- 239000004744 fabric Substances 0.000 description 6
- 238000005259 measurement Methods 0.000 description 6
- 229920002994 synthetic fiber Polymers 0.000 description 6
- 239000012209 synthetic fiber Substances 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 4
- 238000010276 construction Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000010998 test method Methods 0.000 description 4
- 239000000853 adhesive Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- 239000004760 aramid Substances 0.000 description 3
- 229920006231 aramid fiber Polymers 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 239000004593 Epoxy Substances 0.000 description 2
- 229920002430 Fibre-reinforced plastic Polymers 0.000 description 2
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 2
- 239000011151 fibre-reinforced plastic Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000004080 punching Methods 0.000 description 2
- 238000004154 testing of material Methods 0.000 description 2
- 239000004753 textile Substances 0.000 description 2
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- 229920000742 Cotton Polymers 0.000 description 1
- 229920000271 Kevlar® Polymers 0.000 description 1
- 229920003368 Kevlar® 29 Polymers 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000004745 nonwoven fabric Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 239000012783 reinforcing fiber Substances 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 229920002803 thermoplastic polyurethane Polymers 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000009941 weaving Methods 0.000 description 1
Images
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- Reinforcement Elements For Buildings (AREA)
- Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
- Woven Fabrics (AREA)
- Bridges Or Land Bridges (AREA)
- Lining And Supports For Tunnels (AREA)
Description
本発明は、鉄道トンネルなどの補修、補強に用いられるコンクリート構造物補強用繊維シート及び補強方法に関するものである。さらに詳しくは、コンクリート構造物の劣化に伴ってひび割れが生じた際のコンクリート塊の落下を防止するための補強用繊維シートならびにその補強方法に関する。 The present invention relates to a fiber sheet for reinforcing a concrete structure used for repairing and reinforcing a railway tunnel and a reinforcing method. More specifically, the present invention relates to a reinforcing fiber sheet for preventing a concrete lump from falling when a crack is generated due to deterioration of a concrete structure, and a reinforcing method thereof.
コンクリート構造物の補強は一般に、劣化コンクリートの除去、ひび割れ補強剤の注入、覆工コンクリートの打設といった手順が取られるが、高所での重作業が多く、簡便な方法が求められている。
これに対して、合成繊維製の織物や編物、不織布などを補強部に貼り、その上から樹脂を塗布・硬化させる、いわゆるＦＲＰ（ｆｉｂｅｒ ｒｅｉｎｆｏｒｃｅｄ ｐｌａｓｔｉｃ）を形成する補強方法が提案されている。
Reinforcement of concrete structures generally involves procedures such as removal of deteriorated concrete, injection of crack reinforcement, and placement of lining concrete, but there are many heavy work in high places and a simple method is required.
On the other hand, there has been proposed a reinforcing method for forming a so-called fiber reinforced plastic (FRP) in which a woven fabric, a knitted fabric, a nonwoven fabric or the like made of a synthetic fiber is attached to a reinforcing portion, and a resin is applied and cured thereon.
特に、トンネル覆工に地圧や水圧等の外力が作用すると、過大な軸力が発生する。それにより、覆工中の層間にひび割れが発生し、覆工耐力が急激に低下する現象が生じる。そこで、その覆工の補修を行う必要がある。
その補修を繊維シートで行う場合には、従来は、アラミド系繊維、炭素繊維が用いられている。
In the case where the repair is performed with a fiber sheet, aramid fibers and carbon fibers are conventionally used.
しかしながら、上記した従来の方法では繊維シート内部への硬化樹脂の含浸が悪く気泡が生じたり、樹脂と繊維の破断伸度の差が大きいために十分な補強性能が得られなかったり、施工時の繊維シートへの樹脂の染み込みに時間がかかる、等の問題を有していた。
本発明は、上記状況に鑑みて、特定の物性と構造を持つ合成繊維シートを用いることにより、低いコストで、十分な補強性能を得ることができるコンクリート構造物補強用繊維シート及び補強方法を提供することを目的とする。
However, in the conventional method described above, the impregnation of the cured resin into the fiber sheet is poor and air bubbles are generated, or because the difference between the elongation at break of the resin and the fiber is large, sufficient reinforcement performance cannot be obtained, or at the time of construction There was a problem that it took time for the resin to soak into the fiber sheet.
In view of the above circumstances, the present invention provides a fiber sheet for reinforcing a concrete structure and a reinforcing method capable of obtaining sufficient reinforcement performance at low cost by using a synthetic fiber sheet having specific physical properties and structure. The purpose is to do.
本発明は、上記目的を達成するために、 〔１〕以下の条件を満足するポリビニルアルコール系繊維シートからなるコンクリート構造物補強用繊維シート。
（ａ）強度が緯糸、経糸とも４００〜１０００Ｎ／ｃｍ
（ｂ）破断伸度が緯糸、経糸とも５〜１０％
（ｃ）カバーファクターが４０〜１００％
（ｄ）２０℃、３０分間でのスチレンモノマー吸い上げ長が１２ｃｍ以上
〔２〕上記〔１〕記載のコンクリート構造物補強用繊維シートにおいて、前記経糸、緯糸に撚りがかかっていることを特徴とする。
In order to achieve the above object, the present invention provides: [1] A fiber sheet for reinforcing a concrete structure comprising a polyvinyl alcohol fiber sheet that satisfies the following conditions.
(A) Strength is 400 to 1000 N / cm for both weft and warp
(B) The breaking elongation is 5 to 10% for both the weft and the warp
(C) Cover factor is 40-100%
(D) The styrene monomer uptake length at 20 ° C. for 30 minutes is 12 cm or more. [ 2 ] In the fiber sheet for reinforcing a concrete structure according to [1], the warp and weft are twisted. .
〔３〕コンクリート構造物の補強方法であって、上記〔１〕又は〔２〕記載のコンクリート構造物補強用繊維シートに常温硬化型樹脂を含浸させることを特徴とする。
〔４〕コンクリート構造物の補強方法であって、上記〔１〕又は〔２〕記載のコンクリート構造物補強用繊維シートに光硬化型樹脂を含浸させることを特徴とする。
[ 3 ] A method for reinforcing a concrete structure, wherein the fiber sheet for reinforcing a concrete structure according to the above [1] or [2] is impregnated with a room temperature curable resin.
[ 4 ] A method for reinforcing a concrete structure, wherein the fiber sheet for reinforcing a concrete structure according to the above [1] or [2] is impregnated with a photocurable resin.
本発明によれば、以下のような効果を奏することができる。
（１）特定の物性と構造を持つポリビニルアルコール系繊維シートを用いることにより、低いコストで、十分な補強性能を得ることができる。
（２）樹脂の含浸性が高い。
（３）強度が大きい。
According to the present invention, the following effects can be achieved.
(1) By using a polyvinyl alcohol fiber sheet having specific physical properties and structure, sufficient reinforcing performance can be obtained at low cost.
(2) High resin impregnation.
(3) High strength.
（４）常温硬化型樹脂に対する親和性に優れている。
（５）本発明のポリビニルアルコール系繊維シートの価格は、従来のアラミド系繊維の価格に比べて廉価である（表１参照）。
(4) it has excellent affinity for normal temperature curing resin.
(5) The price of the polyvinyl alcohol fiber sheet of the present invention is lower than the price of conventional aramid fibers (see Table 1).
本発明のポリビニルアルコール系繊維シートからなるコンクリート構造物補強用繊維シートは、
（ａ）強度が緯糸、経糸とも４００〜１０００Ｎ／ｃｍ
（ｂ）破断伸度が緯糸、経糸とも５〜１０％
（ｃ）カバーファクターが４０〜１００％
（ｄ）２０℃、３０分間でのスチレンモノマー吸い上げ長が１２ｃｍ以上
の条件を満足する合成繊維シートからなる。
A fiber sheet for reinforcing a concrete structure comprising the polyvinyl alcohol fiber sheet of the present invention,
(A) Strength is 400 to 1000 N / cm for both weft and warp
(B) The breaking elongation is 5 to 10% for both the weft and the warp
(C) Cover factor is 40-100%
(D) A synthetic fiber sheet satisfying the condition that the styrene monomer siphoning length at 20 ° C. for 30 minutes is 12 cm or more.
また、繊維シートの緯糸または経糸もしくはその両方の糸に撚りをかけ、繊維シートの目合いを広くすることで、補強コンクリート表面と接着剤との接触面積を広くすることができる。 Further, the contact area between the surface of the reinforced concrete and the adhesive can be increased by twisting the weft and / or the warp of the fiber sheet to widen the mesh of the fiber sheet.
以下、本発明の実施の形態について詳細に説明する。
本発明の繊維シートは、強度が緯糸、経糸とも４００〜１０００Ｎ／ｃｍ以上、破断伸度が５〜１０％、カバーファクターが４０〜１００％であり、２０℃、３０分間でのスチレンモノマー吸い上げ長が１２ｃｍ以上のコンクリート構造物の補強用合成繊維シートである。
Hereinafter, embodiments of the present invention will be described in detail.
The fiber sheet of the present invention has a strength of 400 to 1000 N / cm or more for both the weft and the warp, a break elongation of 5 to 10%, a cover factor of 40 to 100%, and a styrene monomer uptake length at 20 ° C. for 30 minutes. Is a synthetic fiber sheet for reinforcing concrete structures of 12 cm or more.
ここで、繊維シートは強度が緯糸、経糸ともに、４００〜１０００Ｎ／ｃｍである必要がある。これは、４００Ｎ／ｃｍ以下であるとコンクリート構造物の補強性能が不足し、１０００Ｎ／ｃｍ以上にすると繊維シートが厚くなり、樹脂の含浸性が低下するためである。
また、繊維シートの破断伸度は５〜１０％であることが必要である。これは、５％以下であると繊維が樹脂の伸びに追随せずに破断する恐れがあり、１０％以上であると十分な補強効果が得られないためである。
Here, the fiber sheet needs to have a strength of 400 to 1000 N / cm for both the weft and the warp. This is because if the strength is 400 N / cm or less, the reinforcing performance of the concrete structure is insufficient, and if it is 1000 N / cm or more, the fiber sheet becomes thick and the impregnation property of the resin decreases.
Further, the breaking elongation of the fiber sheet needs to be 5 to 10%. This is because if it is 5% or less, the fiber may break without following the elongation of the resin, and if it is 10% or more, a sufficient reinforcing effect cannot be obtained.
繊維シートのカバーファクターは、４０〜１００％である必要がある。これは、４０％以下では施工中に繊維の乱れが生じやすく、繊維が乱れると十分な補強効果が得られないためである。
さらに、本発明の繊維シートは、２０℃、３０分間でのスチレンモノマー吸い上げ長が１２ｃｍ以上である必要がある。スチレンモノマーの吸い上げ性は補強に用いられるエポキシやアクリルといった樹脂の含浸性の指標であり、これが１２ｃｍ以下であると樹脂含浸が不十分となり、施工後に樹脂と繊維シートの間に亀裂が生じる恐れがあるためである。
The cover factor of the fiber sheet needs to be 40 to 100%. This is because if the amount is 40% or less, fiber disturbance is likely to occur during construction, and if the fiber is disturbed, a sufficient reinforcing effect cannot be obtained.
Furthermore, the fiber sheet of the present invention needs to have a styrene monomer uptake length of 12 cm or more at 20 ° C. for 30 minutes. The uptake of styrene monomer is an index of the impregnation property of resins such as epoxy and acrylic used for reinforcement, and if it is 12 cm or less, the resin impregnation becomes insufficient, and there is a risk of cracking between the resin and the fiber sheet after construction. Because there is.
ここで、繊維シートを構成する素材としてはポリビニルアルコール系ポリマーを用いることが好ましい。ポリビニルアルコール系繊維は、適度な剛性と伸びを示す一方でエポキシやアクリル等の常温硬化型樹脂に対する親和性に優れるためである。
図１は本発明の実施例を示す繊維シートの平面模式図であり、図１（ａ）はＦＶＨ−１００（１ｍ2 当たり１００ｇ）のポリビニルアルコール系繊維によって編まれた繊維シート、図１（ｂ）はＦＶＨ−２５０（１ｍ2 当たり２５０ｇ）のポリビニルアルコール系繊維によって編まれた繊維シート、図１（ｃ）はポリビニルアルコール系繊維の繊維束がばらけた状態（素材としてのポリビニルアルコール系ポリマーの繊維束がばらけて、カバーファクターが高い％にある状態）で編まれた繊維シートをそれぞれ示している。図１において、１，１１，２１は緯糸（１，１１は繊維束）、２，１２，２２は経糸（２，１２は繊維束）を示している。
Here, it is preferable to use a polyvinyl alcohol-based polymer as a material constituting the fiber sheet. This is because the polyvinyl alcohol-based fiber exhibits moderate rigidity and elongation, and is excellent in affinity to room temperature curable resins such as epoxy and acrylic.
FIG. 1 is a schematic plan view of a fiber sheet showing an embodiment of the present invention, and FIG. 1 (a) is a fiber sheet knitted with FVH-100 (100 g per m 2 ) polyvinyl alcohol fiber, FIG. ) Is a fiber sheet knitted with FVH-250 (250 g per m 2 ) polyvinyl alcohol fiber, and FIG. 1 (c) is a state in which the fiber bundle of polyvinyl alcohol fiber is scattered (fibers of polyvinyl alcohol polymer as a material) Each of the fiber sheets is knitted in a state in which the bundles are separated and the cover factor is high. In FIG. 1, 1, 11 and 21 are wefts (1, 11 are fiber bundles), and 2, 12, and 22 are warp yarns (2, 12 are fiber bundles).
図２は本発明にかかる繊維シートに織物を用いる場合において、緯糸及び経糸に撚りをかけた状態の繊維シートを示す平面模式図である。
図２において、３１は撚りをかけた緯糸、３２は撚りをかけた経糸である。
このように、繊維シートに織物を用いる場合、緯糸及び経糸の撚り係数は３．０以下であることが望ましい。これは、撚り係数が３．０より大きいと糸の内部に樹脂が含浸しにくくなり、樹脂含浸後の補強性能が低下するためである。
FIG. 2 is a schematic plan view showing a fiber sheet in a state where wefts and warps are twisted when a woven fabric is used for the fiber sheet according to the present invention.
In FIG. 2, 31 is a twisted weft and 32 is a twisted warp.
Thus, when using a woven fabric for the fiber sheet, it is desirable that the twist coefficient of the weft and the warp is 3.0 or less. This is because if the twist coefficient is larger than 3.0, the yarn is less likely to be impregnated with the resin, and the reinforcement performance after the resin impregnation is lowered.
ここで撚り係数とは、糸の撚り回数Ｔ〔回／２．５４ｃｍ〕、糸の繊度Ｎ〔英式綿番手〕に対し、ｋ＝Ｔ／√Ｎで表される係数である。
さらに、繊維シートが織物の場合、目止め処理（緯糸と経糸との交点を糊剤により固定する）は施されていないことが好ましい。目止め処理が施されていると、目止めに用いた糊剤が繊維束の表面に付着しているため、その分、樹脂の含浸性が低下し、補強性能が低下する恐れがあるためである。
Here, the twist coefficient is a coefficient represented by k = T / √N with respect to the number of twists T [twice / 2.54 cm] and the fineness N [English cotton count] of the yarn.
Further, when the fiber sheet is a woven fabric, it is preferable that the sealing treatment (fixing the intersection of the weft and the warp with a glue) is not performed. When the sealing treatment is applied, the adhesive used for the sealing adheres to the surface of the fiber bundle, so that the impregnation property of the resin is reduced and the reinforcing performance may be reduced accordingly. is there.
次に、補強に用いる樹脂について説明する。
繊維シートの補強には、常温硬化型樹脂を用いる。この常温硬化型樹脂は特に限定されないが、エポキシ系樹脂、アクリル系樹脂、ウレタン系樹脂などを用いる。これらの樹脂は施工時に常温で反応するものであればよい。
また、常温硬化型樹脂に代えて、光硬化型樹脂を用いても構わない。
Next, the resin used for reinforcement will be described.
A room temperature curable resin is used to reinforce the fiber sheet. The room temperature curable resin is not particularly limited, and an epoxy resin, an acrylic resin, a urethane resin, or the like is used. These resins should just react at normal temperature at the time of construction.
Further, instead of the room temperature curable resin, a photo curable resin may be used.
以下、本発明の具体例を説明するが、本発明は、これらに限定されるものではない。
ここで、繊維シートの物性測定方法は、ＪＩＳ Ｌ１０９６「一般織物試験方法」に準じた。
（Ａ）カバーファクターの測定方法
繊維シートを平面に置き、シート面に垂直な方向から写真を撮影する。得られた写真を拡大し、一定の繊維シート面積に占める繊維の面積（シート面積から空隙の面積を引いたもの）を算出する。写真撮影の代わりに繊維シートに黒い紙を貼り付け、繊維が乱れないように注意して複写機にて複写画像を取り、その面積から、単位シート面積における繊維分の面積を％表示で算出しても良い。この時、面積の算出は、複写画像を繊維分と空隙分に分けて切り抜き、それぞれの合計重量を求めて算出する。
Hereinafter, specific examples of the present invention will be described, but the present invention is not limited thereto.
Here, the physical property measuring method of the fiber sheet conformed to JIS L1096 “General Textile Testing Method”.
(A) Cover factor measurement method A fiber sheet is placed on a flat surface, and a photograph is taken from a direction perpendicular to the sheet surface. The obtained photograph is enlarged, and the area of the fiber occupying a certain area of the fiber sheet (sheet area minus the void area) is calculated. Paste black paper on the fiber sheet instead of taking a photo, take a copy image with a copier, taking care not to disturb the fiber, and calculate the area of the fiber in the unit sheet area in% from the area. May be. At this time, the area is calculated by dividing the copy image into a fiber part and a gap part and obtaining the total weight of each.
（Ｂ）スチレンモノマー吸い上げ長の測定方法
繊維シートから緯糸又は経糸を３０ｃｍ取り出し、２０℃、６５％ＲＨ（相対湿度）の環境下で２４時間放置した。この糸の一端を把持して垂直に垂らし、下端を２０℃のスチレンモノマーに１ｃｍ漬けた。このまま、３０分間おいた後のスチレンモノマー液の吸い上がった上端から液面までの距離を定規で測定し吸い上げ長（ｃｍ）とする。
(B) Measuring method of styrene monomer uptake length 30 cm of weft or warp was taken out from the fiber sheet and left for 24 hours in an environment of 20 ° C. and 65% RH (relative humidity). One end of this yarn was gripped and hung vertically, and the lower end was immersed in 1 cm of styrene monomer at 20 ° C. As it is, the distance from the upper end of the styrene monomer liquid sucked up after 30 minutes to the liquid surface is measured with a ruler to obtain the sucked length (cm).
（Ｃ）押し抜き試験方法
図３は本発明にかかるかかる押し抜き試験方法に用いる供試体の作製工程図である。
（１）まず、図３（ａ）に示すように、繊維シートの被着体としてコンクリート製Ｕ型ふた（ＪＩＳ Ａ５３３４ ４００×６００×５０ｍｍ）４１を用意した。
（２）次に、図３（ｂ）に示すように、コンクリート製Ｕ型ふた４１の中央部をφ１００ｍｍでコア抜き４２（円柱状にくり抜き）を行った。
(C) Punch Test Method FIG. 3 is a production process diagram of a specimen used for the punch test method according to the present invention.
(1) First, as shown in FIG. 3A, a concrete U-shaped lid (JIS A5334 400 × 600 × 50 mm) 41 was prepared as an adherend of a fiber sheet.
(2) Next, as shown in FIG. 3 (b), the
（３）次いで、図３（ｃ）に示すように、そのコア抜き４２されたコンクリート製Ｕ型ふた４１にアクリル樹脂系プライマー（デンカ ハードロックIIプライマー）４３を塗布し、２４時間、気中（２０℃）で養生を行った。
（４）その後、図３（ｄ）に示すように、アクリル系樹脂（デンカ ハードロックII）４４を５００ｇ／ｍ2 を下塗りした。
(3) Next, as shown in FIG. 3 (c), an acrylic resin-based primer (Denka Hard Rock II primer) 43 was applied to the concrete
(4) Thereafter, as shown in FIG. 3 (d), an acrylic resin (Denka Hard Rock II) 44 was undercoated with 500 g / m 2 .
（５）次に、図３（ｅ）に示すように、アクリル系樹脂４４上に合成繊維シート４５を貼付した。
（６）次に、図３（ｆ）に示すように、さらに同じアクリル系樹脂４６を５００ｇ／ｍ2 上塗りし、２４時間、気中（２０℃）で養生して供試体４７とした。
図４は本発明にかかる供試体の押し抜き試験機の模式図である。
(5) Next, as shown in FIG. 3 (e), a
(6) Next, as shown in FIG. 3 (f), the same
FIG. 4 is a schematic view of a punch tester for a specimen according to the present invention.
上記したようにして得られた供試体４７を、材料試験機５１にセットして中央のコア部を１ｍｍ／ｍｉｎで載荷し、５００Ｎ毎の剥離周長〔剥離先端の円周長さ（ｍｍ）〕を記録した。試験後、押し抜き荷重を剥離周長に対してプロットし、その直線近似の傾きから単位剥離強さ（Ｎ／ｍｍ）を測定した。
なお、本発明の繊維シートにおいては、さらに、繊維シートの縦糸または横糸もしくはその両方に一定間隔でフィラメント（繊維）数、またはデニール（径）数を大きくすることにより、径の大きなストランドを組み入れた繊維シートにより、繊維シートの付着力を向上させることができる。
The
In the fiber sheet of the present invention, strands having a large diameter are incorporated by increasing the number of filaments (fibers) or the number of deniers (diameters) at regular intervals in the warp and / or weft of the fiber sheet. The fiber sheet can improve the adhesion of the fiber sheet.
また、繊維シート貼付前にメッシュの大きなネットまたはグリッドを敷設し、繊維シートとコンクリート面（プライマー層）間に接着剤を十分に介在させ、繊維シートの付着力を向上させる。
（実施例１）
２０００ｄｔｅｘ（デシテックス）のポリビニルアルコール繊維（クラレ製品番５５１６−１）に１００回／ｍ（撚り係数１．５）の撚りをかけたものを緯糸と経糸に用い、緯糸、経糸とも５４本／１５ｃｍの密度で平織りの織物を作製し、コンクリート補強性能を測定した。
Further, a net or grid having a large mesh is laid before sticking the fiber sheet, and an adhesive is sufficiently interposed between the fiber sheet and the concrete surface (primer layer) to improve the adhesion of the fiber sheet.
Example 1
2000 dtex (decitex) polyvinyl alcohol fiber (Kuraray product number 5516-1) twisted 100 times / m (twisting factor 1.5) is used for weft and warp, and both weft and warp are 54/15 cm. A plain weave fabric was prepared at a density and the concrete reinforcement performance was measured.
繊維シートの物性とコンクリート補強性能測定結果を表１に示す。
この織物の重量は１５０ｇ／ｍ2 、引張強度は緯糸５６０Ｎ／ｃｍ、経糸５４０Ｎ／ｃｍ、破断伸度は緯糸７．２％、経糸７．２％で、カバーファクターは５６％、スチレンモノマー吸上げ性は１７ｃｍであった。次に、この繊維シートを用いてコンクリート補強性を押し抜き試験法にて測定したところ、単位剥離強さは４．２Ｎ／ｍｍで十分な補強性を示し、樹脂中の気泡も少なく、長期耐久性も問題のないものであった。
（実施例２）
ポリビニルアルコール繊維の打ち込み密度を７０本／１５ｃｍとした以外は実施例１と同様にして織物を作製し、コンクリート補強性能を測定した。繊維シートの物性とコンクリート補強性能測定結果を表１に示す。実施例１と同様、気泡の少ない補強体が形成され、十分なコンクリート補強性能を示した。
（実施例３）
繊維束をばらけさせ、カバーファクターを１００％とした以外は、実施例１と同様にして織物を作製し、コンクリート補強性能を測定した。繊維シートの物性とコンクリート補強性能測定結果を表１に示す。実施例１と同様に気泡の少ない補強体が形成され、十分なコンクリート補強性能を示した。
（比較例１）
ポリビニルアルコール繊維の打ち込み密度を３９本／１５ｃｍとした以外は、実施例１と同様にして織物を作製し、コンクリート補強性能を測定した。
Table 1 shows the physical properties of the fiber sheet and the measurement results of the concrete reinforcement performance.
This fabric has a weight of 150 g / m 2 , a tensile strength of 560 N / cm for the weft, 540 N / cm for the warp, 7.2% for the weft and 7.2% for the warp, 56% for the cover factor, and styrene monomer uptake. The sex was 17 cm. Next, using this fiber sheet, the concrete reinforcement was measured by a punching test method. The unit peel strength was 4.2 N / mm, indicating sufficient reinforcement, and there were few bubbles in the resin, resulting in long-term durability. There was no problem with sex.
(Example 2)
A woven fabric was prepared in the same manner as in Example 1 except that the polyvinyl alcohol fiber driving density was set to 70/15 cm, and the concrete reinforcing performance was measured. Table 1 shows the physical properties of the fiber sheet and the measurement results of the concrete reinforcement performance. Similar to Example 1, a reinforcing body with few bubbles was formed, and sufficient concrete reinforcing performance was exhibited.
(Example 3)
A woven fabric was produced in the same manner as in Example 1 except that the fiber bundles were separated and the cover factor was 100%, and the concrete reinforcing performance was measured. Table 1 shows the physical properties of the fiber sheet and the measurement results of the concrete reinforcement performance. As in Example 1, a reinforcing body with few bubbles was formed, and sufficient concrete reinforcing performance was exhibited.
(Comparative Example 1)
A woven fabric was prepared in the same manner as in Example 1 except that the polyvinyl alcohol fiber driving density was set to 39/15 cm, and the concrete reinforcing performance was measured.
繊維シートの物性とコンクリート補強性能測定結果を表１に示す。カバーファクター及び繊維シートの強度が低く、コンクリート補強性能も十分ではなかった。
（比較例２）
ポリビニルアルコール繊維を高伸度タイプ（クラレ製品番１２２５−７、繊度１１００ｄｔｅｘ）とし、製織前の撚糸で２本合糸して２２００ｄｔｅｘとした以外は実施例２と同様にして織物を作製し、コンクリート補強性能を測定した。繊維シートの物性とコンクリート補強性能測定結果を表１に示す。繊維シートの破断伸度が大きかったために十分なコンクリート補強性能が得られなかった。また、スチレンモノマー吸い上げ性も低く、成型後の樹脂中に気泡が多く見られ、長期間耐久性に問題を残した。
（比較例３）
織物を構成する繊維を１６７０ｄｔｅｘのアラミド繊維（東レデュポン・ケブラー社製ケブラー２９）とし、打ち込み密度を４１本／１５ｃｍとした以外は、実施例１と同様にして織物を作製し、コンクリート補強性能を測定した。
Table 1 shows the physical properties of the fiber sheet and the measurement results of the concrete reinforcement performance. The cover factor and the strength of the fiber sheet were low, and the concrete reinforcement performance was not sufficient.
(Comparative Example 2)
A woven fabric was prepared in the same manner as in Example 2 except that the polyvinyl alcohol fiber was a high elongation type (Kuraray product number 1225-7, fineness 1100 dtex), and two yarns were combined with a twisted yarn before weaving to give 2200 dtex. Reinforcing performance was measured. Table 1 shows the physical properties of the fiber sheet and the measurement results of the concrete reinforcement performance. Since the breaking elongation of the fiber sheet was large, sufficient concrete reinforcement performance could not be obtained. Further, the styrene monomer absorbability was low, and many bubbles were observed in the resin after molding, leaving a problem in durability for a long time.
(Comparative Example 3)
Fabrics were produced in the same manner as in Example 1 except that the fibers constituting the fabrics were aramid fibers of 1670 dtex (Kevlar 29 manufactured by Toray DuPont Kevlar Co., Ltd.) and the driving density was 41 fibers / 15 cm. It was measured.
繊維シートの物性とコンクリート補強性能測定結果を表１に示す。単位剥離強さは高かったが、樹脂中に気泡が多く見られ、長期間での耐久性に問題が残った。また、材料価格は、実施例１〜２、比較例１〜２に比べて５割程度高いものとなった。 Table 1 shows the physical properties of the fiber sheet and the measurement results of the concrete reinforcement performance. Although the unit peel strength was high, many bubbles were observed in the resin, and there was a problem in durability over a long period of time. In addition, the material price was about 50% higher than Examples 1-2 and Comparative Examples 1-2.
なお、本発明は上記実施例に限定されるものではなく、本発明の趣旨に基づいて種々の変形が可能であり、これらを本発明の範囲から排除するものではない。 In addition, this invention is not limited to the said Example, A various deformation | transformation is possible based on the meaning of this invention, and these are not excluded from the scope of the present invention.
本発明のコンクリート構造物補強用繊維シート及び補強方法は、鉄道トンネル覆工の補修・補強をはじめ、トンネルの変状抑制、橋脚の耐震補強などの対策に利用可能である。 INDUSTRIAL APPLICABILITY The fiber sheet for reinforcing a concrete structure and the reinforcing method of the present invention can be used for countermeasures such as repair and reinforcement of railway tunnel lining, suppression of tunnel deformation, and seismic reinforcement of bridge piers.
１，１１，２１ 緯糸
２，１２，２２ 経糸
３１ 撚りをかけた緯糸
３２ 撚りをかけた経糸
４１ コンクリート製Ｕ型ふた
４２ コア抜き
４３ アクリル樹脂系プライマー
４４，４６ アクリル系樹脂
４５ 合成繊維シート
４７ 供試体
５１ 材料試験機
1,11,21
Claims (4)
（ａ）強度が緯糸、経糸ともに４００〜１０００Ｎ／ｃｍ
（ｂ）破断伸度が緯糸、経糸ともに５〜１０％
（ｃ）カバーファクターが４０〜１００％
（ｄ）２０℃、３０分間でのスチレンモノマー吸い上げ長が１２ｃｍ以上 A fiber sheet for reinforcing a concrete structure comprising a polyvinyl alcohol fiber sheet that satisfies the following conditions.
(A) Strength is 400 to 1000 N / cm for both weft and warp
(B) 5-10% breaking elongation for both weft and warp
(C) Cover factor is 40-100%
(D) Styrene monomer uptake length of 12 cm or more at 20 ° C. for 30 minutes
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| JP2004170015A JP4610936B2 (en) | 2004-06-08 | 2004-06-08 | FIBER SHEET FOR REINFORCING CONCRETE STRUCTURE AND REINFORCING METHOD |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2691848B2 (en) * | 1993-04-26 | 1997-12-17 | 昭和高分子株式会社 | Concrete lining material and lining method |
| JP2002029867A (en) * | 1996-04-26 | 2002-01-29 | Nippon Nsc Ltd | Method for reinforcing concrete structure and radical- polymerizable primer and radical-polymerized hardened resin-forming composition, for use in the same |
| JP2003013612A (en) * | 2001-07-03 | 2003-01-15 | Toray Ind Inc | Method for reinforcing concrete structure |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2691848B2 (en) * | 1993-04-26 | 1997-12-17 | 昭和高分子株式会社 | Concrete lining material and lining method |
| JP2002029867A (en) * | 1996-04-26 | 2002-01-29 | Nippon Nsc Ltd | Method for reinforcing concrete structure and radical- polymerizable primer and radical-polymerized hardened resin-forming composition, for use in the same |
| JP2003013612A (en) * | 2001-07-03 | 2003-01-15 | Toray Ind Inc | Method for reinforcing concrete structure |
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